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Precision Software Appli…tions Silver Collection 1
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Precision Software Applications Silver Collection Volume One (PSM) (1993).iso
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arsg10.exe
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ARSGDAT.4BI
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1992-10-04
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10KB
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389 lines
;/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\:
; :
; AMATEUR RADIO STUDY GUIDE v1.00 :
; :
; Copyright (c) 1992 David Drzyzga - All Rights Reserved :
; :
; Based on a program coded in BASIC by Russ Revels :
; :
;/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\:
;
; You can include comments an the file anywhere you want
; just like these comments. You cannot put a comment in
; the middle of a line though.
;
; When modifying this file, there are several things you
; must be aware of:
;
; -> Any line of text in this file cannot exceed 65 characters!
; this is the 65th character^
;
; No harm will be done, but nothing over 65 characters will
; be read by the program.
;
; -> Do not make questions more than 20 lines long, or you
; will receive an 'out of memory' error when you execute
; the program.
;
; -> You can add or delete questions as you please, just be
; sure to follow the format of the existing questions.
;
;
;
(4BI-1A.1)
What is an isotropic radiator?
A. A hypothetical, omnidirectional antenna
*
(4BI-1B.1)
When is it useful to refer to an isotropic radiator?
A. When comparing the gains of directional antennas
*
(4BI-1B.2)
What theoretical reference antenna provides a comparison for
antenna measurements?
D. Isotropic radiator
*
(4BI-1B.3)
What purpose does an isotropic radiator serve?
B. It is used as a reference for antenna gain measurements
*
(4BI-1B.4)
How much gain does a 1/2-wavelength dipole have over an
isotropic radiator?
B. About 2.1 dB
*
(4BI-1B.5)
How much gain does an antenna have over a 1/2-wavelength dipole
when it has 6 dB gain over an isotropic radiator?
A. About 3.9 dB
*
(4BI-1B.6)
How much gain does an antenna have over a 1/2-wavelength dipole
when it has 12 dB gain over an isotropic radiator?
B. About 9.9 dB
*
(4BI-1C.1)
What is the antenna pattern for an isotropic radiator?
D. A sphere
*
(4BI-1C.2)
What type of directivity pattern does an isotropic radiator
have?
D. A sphere
*
(4BI-2A.1)
What is the radiation pattern of two 1/4-wavelength vertical
antennas spaced 1/2 wavelength apart and fed 180 degrees out of
phase?
D. Figure-8 end-fire in line with the antennas
*
(4BI-2A.2)
What is the radiation pattern of two 1/4-wavelength vertical
antennas spaced 1/4 wavelength apart and fed 90 degrees out of
phase?
A. Unidirectional cardioid
*
(4BI-2A.3)
What is the radiation pattern of two 1/4-wavelength vertical
antennas spaced 1/2 wavelength apart and fed in phase?
C. Figure-8 broadside to the antennas
*
(4BI-2A.4)
How far apart should two 1/4-wavelength vertical antennas be
spaced in order to produce a figure-8 pattern that is broadside
to the plane of the verticals when fed in phase?
C. 1/2 wavelength
*
(4BI-2A.5)
How many 1/2 wavelengths apart should two 1/4-wavelength
vertical antennas be spaced to produce a figure-8 pattern that
is in line with the vertical antennas when they are fed 180
degrees out of phase?
A. One half wavelength apart
*
(4BI-2A.6)
What is the radiation pattern of two 1/4-wavelength vertical
antennas spaced 1/4 wavelength apart and fed 180 degrees out of
phase?
D. Figure-8 end-fire in line with the antennas
*
(4BI-2A.7)
What is the radiation pattern for two 1/4-wavelength vertical
antennas spaced 1/8 wavelength apart and fed 180 degrees out of
phase?
D. Figure-8 end-fire in line with the antennas
*
(4BI-2A.8)
What is the radiation pattern for two 1/4-wavelength vertical
antennas spaced 1/8 wavelength apart and fed in phase?
A. Omnidirectional
*
(4BI-2A.9)
What is the radiation pattern for two 1/4-wavelength vertical
antennas spaced 1/4 wavelength apart and fed in phase?
B. Elliptical
*
(4BI-3A.1)
What is a resonant rhombic antenna?
B. A bidirectional antenna open at the end opposite that to
which the transmission line is connected and with each side
approximately equal to one wavelength
*
(4BI-3B.1)
What is a nonresonant rhombic antenna?
A. A unidirectional antenna terminated in a resistance equal to
its characteristic impedance
*
(4BI-3B.2)
What are the advantages of a nonresonant rhombic antenna?
A. Wide frequency range, high gain and high front-to-back ratio
*
(4BI-3B.3)
What are the disadvantages of a nonresonant rhombic antenna?
D. It requires a large area and four sturdy supports for proper
installation
*
(4BI-3B.4)
What is the characteristic impedance at the input of a
nonresonant rhombic antenna?
D. 700 to 800 ohms
*
(4BI-3C.1)
What is the effect of a terminating resistor on a rhombic
antenna?
B. It changes the radiation pattern from essentially
bidirectional to essentially unidirectional
*
(4BI-3C.2)
What should be the value of the terminating resistor on a
rhombic antenna?
C. About 800 ohms
*
(4BI-4A.1)
What factors determine the receiving antenna gain required at an
amateur station in earth operation?
A. Height, transmitter power and antennas of satellite
*
(4BI-4A.2)
What factors determine the EIRP required by an amateur station
in earth operation?
A. Satellite antennas and height, satellite receiver sensitivity
*
(4BI-4A.3)
What factors determine the EIRP required by an amateur station
in telecommand operation?
B. Satellite antennas and height, satellite receiver sensitivity
*
(4BI-4A.4)
How does the gain of a parabolic dish type antenna change when
the operating frequency is doubled?
C. Gain increases 6 dB
*
(4BI-4B.1)
What happens to the beamwidth of an antenna as the gain is
increased?
D. The beamwidth decreases as the gain is increased
*
(4BI-4B.2)
What is the beamwidth of a symmetrical pattern antenna with a
gain of 20 dB as compared to an isotropic radiator?
B. 20.3 degrees
*
(4BI-4B.3)
What is the beamwidth of a symmetrical pattern antenna with a
gain of 30 dB as compared to an isotropic radiator?
B. 6.4 degrees
*
(4BI-4B.4)
What is the beamwidth of a symmetrical pattern antenna with a
gain of 15 dB as compared to an isotropic radiator?
C. 36.1 degrees
*
(4BI-4B.5)
What is the beamwidth of a symmetrical pattern antenna with a
gain of 12 dB as compared to an isotropic radiator?
D. 51.0 degrees
*
(4BI-4C.1)
How is circular polarization produced using linearly- polarized
antennas?
C. Arrange two Yagis perpendicular to each other, with the
driven elements in the same plane, and fed 90 degrees out of
phase
*
(4BI-4C.2)
Why does an antenna system for earth operation (for
communications through a satellite) need to have rotators for
both azimuth and elevation control?
C. In order to track the satellite as it orbits the earth
*
(4BI-5.1)
What term describes a method used to match a high-impedance
transmission line to a lower impedance antenna by connecting the
line to the driven element in two places, spaced a fraction of a
wavelength on each side of the driven element center?
B. The delta matching system
*
(4BI-5.2)
What term describes an unbalanced feed system in which the
driven element is fed both at the center of that element and a
fraction of a wavelength to one side of center?
A. The gamma matching system
*
(4BI-5.3)
What term describes a method of antenna impedance matching that
uses a short section of transmission line connected to the
antenna feed line near the antenna and perpendicular to the feed
line?
D. The stub matching system
*
(4BI-5.4)
What should be the approximate capacitance of the resonating
capacitor in a gamma matching circuit on a 1/2-wavelength dipole
antenna for the 20-meter band?
B. 140 pF
*
(4BI-5.5)
What should be the approximate capacitance of the resonating
capacitor in a gamma matching circuit on a 1/2-wavelength dipole
antenna for the 10-meter band?
A. 70 pF
*
(4BI-6A.1)
What kind of impedance does a 1/8-wavelength transmission line
present to a generator when the line is shorted at the far end?
C. An inductive reactance
*
(4BI-6A.2)
What kind of impedance does a 1/8-wavelength transmission line
present to a generator when the line is open at the far end?
C. A capacitive reactance
*
(4BI-6B.1)
What kind of impedance does a 1/4-wavelength transmission line
present to a generator when the line is shorted at the far end?
A. A very high impedance
*
(4BI-6B.2)
What kind of impedance does a 1/4-wavelength transmission line
present to a generator when the line is open at the far end?
B. A very low impedance
*
(4BI-6C.1)
What kind of impedance does a 3/8-wavelength transmission line
present to a generator when the line is shorted at the far end?
C. A capacitive reactance
*
(4BI-6C.2)
What kind of impedance does a 3/8-wavelength transmission line
present to a generator when the line is open at the far end?
C. An inductive reactance
*
(4BI-6D.1)
What kind of impedance does a 1/2-wavelength transmission line
present to a generator when the line is shorted at the far end?
B. A very low impedance
*
(4BI-6D.2)
What kind of impedance does a 1/2-wavelength transmission line
present to a generator when the line is open at the far end?
A. A very high impedance
*